Thanks Crank. The forge is two half bricks hole sawed to create the chamber no hole stops about 4mm short from the back. That image was during it’s build. I used a spade drill bit to put hole at front right side and another at back side left for two blow torch heads one powered by a bottle of map gas and the other propane… two is overkill one is plenty. It’s a great way to reuse old circ and table saw blades I cut them up with an angle grinder and shape them on sander and heat treat to made crappy little workshop knives that are used for trimming, carving, glue ups etc this was my first go at a proper nice(ish) knife.